Furnace.



Patented February 28, 190',

rear trims.

LOUIS PHILIPP COl-IEN, ()F NlCl V YORK, N. Y.

,QPECIFICATION forming part of Letters Patent No. 783,614, dated February 2%, 1905.

Application filed December 29. 1903. Serial No, 187,000 i To It 1071/0171 71/; may concern:

Be itknown thatl, LOUIS PHILIrr loans, a citizen of the United States, and a resident of New York, in the county and State of New York, have invented new and useful improvements in Furnaces, of which the following is a specification.

This invention relates more particularly to steam-boiler and other furnaces having inclined grates, a fuel-ho )per above the grates, and means for feeding the fuel from the hopper upon the upper ends of the grates.

My invention has for its object to provide a simple, eliicient, and satisfactory mechanical apparatus for shaking the grate with a view of maintail'iing a practically even layer of coal, breaking up the coat of silicate which is liable to be formed under the prevailing high temperature, and facilitating the movement of the coal over the grate.

In the accompanying drawings, consisting of two sheets, Figure 1 is a longitudinal sectional elevation of a furnace provided with my improvements. Fig. 2 is a fragmentary rear view of the front portion of the roof of the combustion-chamber in line 2 52, Fig. 1. Fig. 3 is a perspective view of one of the ren'iovable throat-plates. Fig. L is a side elevation of the driving-shaft and its chain-pub ley. Fig. is a fra, ;mentary bottom View of the upper portion of the main grate, on an enlarged scale, viewed in the direction of the arrow Fig. 5 is a transverse section in line l1 (3, Fig. I, looking rearward. Fig. '7 is a horizontal section taken above the shaft of the rock-arms in line7 7,.Fig. 1. Fig. 8 isan enlarged fragmentary front elevation of the movable cleaner-grate, the bars of the main grate appearing in section. l ig. 9 is a top plan view of the front portion of the roof of the conihustioirchaniber, the brackets being omitted. Fig. 10 is a side elevation of the mechanism for operating the rock-arms of the main grate.

Like letters of reference refer to like parts in the several figures.

A represents the side walls of the furnace; A, the front wall; A the ash-pit, and A the combustion-chainber.

B re n'esents the front portion of the roof cin its lowerside, through which the air is de-.

livered into the upper portion oi the combustion-chamber.

1.) represents the,fuel-hopper, which is arranged above and in front of the hollow crossbeam (,1 and preferably hinged or pivoted at the front, as shown at 1/.

The front portion B of the roof of the combustion-chamber composed of lire-bricks /1, which are arranged loosely side by side and supported at the front by a rib or flange 7;, projecting rearwardly from the lower edge of the hollow beam C and at the rear by brackots B having at their lower ends forwardlyprojecting ribs or flanges I). lflach brick is supported at its front side by a ledge 11 upon the rib l) and at its rear side by the rib b, which projects into a groove 7) in the rear side of the brick. The brackets are secured to the rear face of the upper rib f)" of the cross-beam C. These bricks are suspended at their upper cold parts and are allowed to expand freely under the influence of the high temperature of the furnace. A sheet of asbestos is placed, preferably, in every joint. and the whole row of bricks is pressed together by a screw 6 as represented in Fig. .l, or some other suitable device. The life of the bricks is thus increased, and the removal of them, if they are required to be replaced, is easily aeeomplished upon detaching the brackets. lly the action of these bricks the temperature of combustion is much increased, thereby improving the combustion, saving fuel, and improving the effect of the boiler.

1*) represents a rotating feed-roller whereby the fuel issuing from the hopper is propelled downwardly toward the grate. 'lhis feedrolleris arrangedtranswu'sely underneiuih the hopper-outlet and consists of a sleeve w, which is mounted on a transverse shaft e and carries longitudinal ribs or wings (1 ii, feed-throat is formed between the rear side of the feedroller and the front of the hollow cross-beam U, through which throat the fuel passes from the hopper down to the grate.

The width of this throat can be changed by removable l lining-plates F, as the thickness of the layer of fuel or the size of the fuel may require.

These throat-plates are supported by hooks f I plates can be removed and replaced by similar plates of greater or less thickness to contract or enlarge the throat.

The front portion of the feed-roller is inclosed in a semicylindrical casing Gr, having its upper edge adjacent to the front edge of the hopper-outlet. This roller rotates in such a direction that its wings sweep downwardly through the front portion of the feed-throat and upwardly through the casing. The feeding action of the feed-roller becomes effective only when the fuel is shaken down, because the wings of the roller are just wide enough to take hold of the fuel to keep the throat filled up; but they are not so wide as to extend across the feed-throat. Hence when the outlet of the throat is filled with fuel the wings carry the fuel around through the upwardly-increasing space of the casing without feeding the fuel downward.

The feed-roller shaft is journaled near its ends in bearings It, arranged in the side walls, and is provided at one end with a worm-wheel 7t, which is engaged by a worm 7L rotated by a driving mechanism of any suitable construction-for instance, a pulley it" and belt 71.".

I represents the top grate, which extends downwardly and forwardly from the lower portion of the feed-roller casing and which is in an inclined position.

of angular form in order to keep its spaces free for the passage of air.

K represents the main grate, which extends rearwardly from the lower end of the top grate The main grate is composed of two series of grate-bars k and H, which alternate with each other andare pivoted or movably supported near their lower ends, so that their upper ends can be swung backwardly and forwardly or upwardly and downwardly in an oblique direction aboutthe lower support as a pivot. For that purpose these grate-bars are preferably provided near their lower ends with half-round sockets Z1, by which they rest loose] y upon a corresponding cross-bar Z The main-grate bars are secured together to form two sets in which the grate-bars alternate. The two sets can be moved up and down in opposite directions for shaking the grate, and they can be lowered together for giving access to the combustionchamber. For these purposes the following mechanism is provided.

L represents a supporting and agitating shaft arranged transversely in front of or below the upper portions of the main-grate bars and supporting the latter. This shaft is journaled near its ends in bearings Z of any suitable construction, formed on the rear ends of rock-arms l. The front ends of these rockarms are secured to a transverse rock-shaft which is journaled in bearings at or near the front wall of the furnace and provided with a suitable operating mechanism for instance, a segment Z worm-shaft and worm 7* Z, and hand-wheel Z Upon turning the rock-shaft in the proper direction to lower the suprmrting-shaft both sets of main-grate bars are swung downwardly, as indicated by the dotted lines in Fig. 1, thereby affording access to the combustion-chamber for preparing the grate for starting the fire or for pushing the fire back for banking.

The two sets of grate-bars can be moved up and down a short distance alternately or in opposite directions for loosening 0r detaching the layer of coal, breaking up the layer of silicate formed by the molten ashes produced by the very high temperature in the furnace, and for shaking down the ashes. This alternating rocking movement is imparted to the two sets of grate-bars as follows: The maingrate bars 1.3 k are provided near their upper ends with downwardly-extending lugs m and n respectively, which are connected by transverse bars m and 22 respectively, so that all bars of each series are moved simultaneously. 0 0 represent eccentrics or cams secured to the supporting and agitating shaft L, near the ends thereof, and supporting, respectively, a pair of the rocking grate-bars Zr and L The two pairs of cams are arranged out of line, as shown in Figs. 1 and 6, or otherwise, so that upon rotating the agitating-shaft L they cause the two sets of bars to move in opposite directions forwardly and backwardly.

P represents a short driving-shaft which is arranged to'be coupled with the agitatingshaft L when the latter is in its normal operative position. This driving-shaft is arranged axially in line with the operative position of the agitating-shaft and journaled in a bearing 1), arranged in one of the side walls of the furnace. This driving-shaft is driven by any suitable mechanism for instance, by a sprocket-wheel p, operated by a chain belt 17 from a sprocket-wheel 71, mounted on the feedroller.

Q represents a coupling rod or pin whereby the driving-shaft P and the agitating-shaft L are coupled for driving the latter. This rod is flat-sided and is inserted in a correspondingly-shaped opening (1 and socket (1 formed lengthwise in the driving-shaft P and the adjacent end of the agitatinggshaft L, respectively. Upon withdrawing the coupling-rod from the agitatingshaft by means of the handle Q3, formed on the outer end of the rod, the agitating-shaft is uncoupled and free to be swung down for lowering both sets of the main-grate bars. The inner end of the coupling-rod is preferably tapered to facilitate its entrance into the socket of the agitating-shaft.

reaeia it represents the lower or slag grate, which is arranged in a nearly-horizontal position at a short distance below the main grate and which extends rearwardly therefrom for receiving ashes and clinkers. This grate is supported at its front and rear ends by cross-bars r r, respectively, and is separated "from the lower end of the main grate by a cleaning opening or space 1- through which the ashes and slags are removed.

hi represents a movable cleaner-grate which closes the cleaning-opening between the main grate and the slag-grate and which can be swung out of the way forwardly and downwardly, as indicated by dotted lines in Fig. l, to permit the ashes and slags to be removed from the slag-grate. The cleaner-grate is pivoted at its lower end to forwardly-projecting lugs s, secured to the cross-bar w, and stands at an angle of about sixty degrees to the horizon when in its normal position. The cleanergrate is composed of thin bars arranged to project with their upper ends into the spaces between the lower ends of the main-grate bars, which latter are at their lower ends so thin that the bars of the cleaner-grate can enter into the spaces between them, as represented in Fig. 8. This prevents the formation of an objectionable opening between the main-grate bars and the upper end of the cleaner-grate when the main grate is swung down for giving access to the combustion-chamber, as rep resented in dotted lines in Fig. 1.

T is a shifting-rod by which the cleanergrate is opened and closed and which is pivoted at its rear end to an arm t, projecting forwardly from the channel-iron t, to which the grate-bars are secured. This shiftinga'od extends to the front wall of the furnace and is held out of the way by hanging its handle t on a bracket 6.

I: claim as my invention-- 1. The com bination, of two series of inclined grate-bars, the bars of one series alternating with the bars of the other series, a cross-piece by which the bars of each series are rigidly connected, a stationary crossbar upon which the bars are supported near their lower ends and on which said bars can oscillate, a transverse agitating-shaft arranged underneath the upper portions of the bars and provided with two sets of cams which project in opposite directions and each of which supports a series of said bars, and mechanism for rotating said shaft, substantially as set forth.

2. The combination of a grate pivoted near one end, an agitating-shaft arranged underneath the grate near the other end thereof and provided with cams on which the grate rests, means for rotating said shaft, and verticallymovable supports on which said shaft journalcd and by which said shaft and the grate can be raised and lowered together, substan tially as set forth.

3. The combination of an inclined grate, a stationary support on which the grate is supported near its lower end, an, agitatingshaft arranged underneath the upper portion of the grate and provided with cams on which the grate rests, means for rotating said shaft, and rock-arms on which said shaft is journaled and which are movable up and down, substantially as set forth.

4:. The combination of two series of gratebars, the bars of one series alternating with the bars of the other series, a stationary support on which the bars are supported and on which said bars can oscillate, a transverse agitating-shaft arranged underneath the gratebars at a distance from said stationary support and provided with two sets of cams which project in opposite directions and each of which supports a series of said bars, means for retating said shaft to oscillate the two series of bars'in opposite directions, and rock-arms in which said shaft is journaled and which are movable up and down for raising or lowering said shaft and both sets of bars, substantially as set forth.

5. The combination of a movable grate, an agitating-shaft engaging the same and mount ed in movable supports, a driving-shaft arranged in line with the operative position of said agitating-shaft, and a coupling device for connecting said agitating-shaft with said driving-shaft or disconnecting it therefrom, substantially as set forth.

6. The combination of a movable grate, an agitating shaft engaging the same and mounted in movable supports, rock-arms in which said shaft is journaled and which can be swung down for lowering the grate out of its normal position, a driving-shaft in line with the operative position of said agitating-shaft, and a coupling device for connecting said agitatil'igshaft with said driving-shaft or disconnecting it therefrom, substantially as set forth.

7. The combination of an inclined grate pivotally supported near its lower end, an agitating-shaft arranged below the grate near its upper end, rock-arms in which said shaft is journaled, a driving-shaft arranged in line with said agitatingshaft in the operative position of the latter, and a releasable coupling connecting the driving-shaft with the agitating-shaft, substantially as set forth.

8. The combination of a grate composed. of two sets of grate-bars, each set being niovabl y supported and capable of independent as well as simultaneoliis movement, a shaft provided with agitating devices which operate upon each set of bars, a movable support for said shaft, a driving-shaft, and a coupling device which connects the driving-shaft with the agitating-shaft in the operative position of the latter, and upon being uncoupled, permits the support and the grate to be lowered, substantially as set forth 9. The combination of a movable grate, an the socket of said agitating-shaft, substanagitating-shaft arranged below the same havtially as set forth.

. i i 111g a socket in its end, agitatingcams ari \Nitness my hand this 21st day of Decemranged on said shaft, a movable support for her, 1903. said shaft, a hollow driving-shaft arranged in LOUIS PHILIPP COHEN. line With the operative position of said agi- Vitnesses:

tating-shaft, and a coupling-pin adapted to be inserted in said hoiloW driving-shaft and THoMAs T. CRo'rTY, HERBERT STRAUT. 

